[DI] added possibility to define services with abstract arguments

[fabpot]

Q	A
Feature PR	symfony/symfony#35076
PR author(s)	@Islam93
Merged in	5.1-dev

[carsonbot]

Thank you for this issue.
There has not been a lot of activity here for a while. Has this been resolved?

[carsonbot]

Could I get a reply or should I close this?

[javiereguiluz]

Closing as fixed in #18633.